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Pickering: Iran sanctions alone won't stop nuclear program

07:55 | Apr. 19, 2019 Retired U.S. Ambassador Thomas Pickering talks with CBS News State Department correspondent Margaret Brennan about the paper he authored with colleagues warning against a U.S. attack on Iran's nuclear facilities without a thorough cost/benefit analysis. With time, he explains, a "sensible civilian program" in Iran could be possible, but not until after Nov. 6. "No president in an election period wants to appear to be entering into diplomatic compromises, particularly if they involve taking some risks," he says.